Problemas con certificados de KDC
Algunas veces se recibe este error en el Domain Controllers Event Type: Warning Event Source: KDC Event Category: None Event ID: 20 Date: 9/1/2004 Time: 3:27:54 AM User: N/A Computer: MyServer Description: The currently selected KDC certificate was once valid, but now is invalid and no suitable replacement was found. Smartcard logon may not function correctly if this problem is not remedied. Have the system administrator check on the state of the domain's public key infrastructure. The chain status is in the error data. Esto se debe a que el DC contiene una referencia a un certicado invalido, para arreglar esto ejecute el siguiente comando. certutil -dcinfo deleteBad